clang/test/Sema/struct-decl.c

   1 // RUN: %clang_cc1 -Wno-pointer-to-int-cast -fsyntax-only -verify %s
   2 // PR3459
   3 struct bar {
   4   char n[1];
   5 };
   6
   7 struct foo {
   8   char name[(int)&((struct bar *)0)->n]; // expected-warning {{folded to constant}}
   9   char name2[(int)&((struct bar *)0)->n - 1]; // expected-error {{array size is negative}}
  10 };
  11
  12 // PR3430
  13 struct s {
  14   struct st {
  15     int v;
  16   } *ts;
  17 };
  18
  19 struct st;
  20
  21 int foo(void) {
  22   struct st *f;
  23   return f->v + f[0].v;
  24 }
  25
  26 // PR3642, PR3671
  27 struct pppoe_tag {
  28  short tag_type;
  29  char tag_data[];
  30 };
  31 struct datatag {
  32   struct pppoe_tag hdr; //expected-warning{{field 'hdr' with variable sized type 'struct pppoe_tag' not at the end of a struct or class is a GNU extension}}
  33   char data;
  34 };
  35
  36
  37 // PR4092
  38 struct s0 {
  39   char a;  // expected-note {{previous declaration is here}}
  40   char a;  // expected-error {{duplicate member 'a'}}
  41 };
  42
  43 struct s0 f0(void) {}
  44
  45 // <rdar://problem/8177927> - This previously triggered an assertion failure.
  46 struct x0 {
  47   unsigned int x1;
  48 };
  49
  50 // rdar://problem/9150338
  51 static struct test1 { // expected-warning {{'static' ignored on this declaration}}
  52   int x;
  53 };
  54 const struct test2 { // expected-warning {{'const' ignored on this declaration}}
  55   int x;
  56 };
  57 inline struct test3 { // expected-error {{'inline' can only appear on functions}}
  58   int x;
  59 };
  60
  61 struct hiding_1 {};
  62 struct hiding_2 {};
  63 void test_hiding(void) {
  64   struct hiding_1 *hiding_1(void);
  65   extern struct hiding_2 *hiding_2;
  66   struct hiding_1 *p = hiding_1();
  67   struct hiding_2 *q = hiding_2;
  68 }
  69
  70 struct PreserveAttributes {};
  71 typedef struct __attribute__((noreturn)) PreserveAttributes PreserveAttributes_t; // expected-warning {{'noreturn' attribute only applies to functions and methods}}
  72
  73 // PR46255
  74 struct FlexibleArrayMem {
  75   int a;
  76   int b[];
  77 };
  78
  79 struct FollowedByNamed {
  80   struct FlexibleArrayMem a; // expected-warning {{field 'a' with variable sized type 'struct FlexibleArrayMem' not at the end of a struct or class is a GNU extension}}
  81   int i;
  82 };
  83
  84 struct FollowedByUnNamed {
  85   struct FlexibleArrayMem a; // expected-warning {{field 'a' with variable sized type 'struct FlexibleArrayMem' not at the end of a struct or class is a GNU extension}}
  86   struct {
  87     int i;
  88   };
  89 };
  90
  91 struct InAnonymous {
  92   struct { // expected-warning-re {{field '' with variable sized type 'struct InAnonymous::(anonymous at {{.+}})' not at the end of a struct or class is a GNU extension}}
  93
  94     struct FlexibleArrayMem a;
  95   };
  96   int i;
  97 };
  98 struct InAnonymousFollowedByAnon {
  99   struct { // expected-warning-re {{field '' with variable sized type 'struct InAnonymousFollowedByAnon::(anonymous at {{.+}})' not at the end of a struct or class is a GNU extension}}
 100
 101     struct FlexibleArrayMem a;
 102   };
 103   struct {
 104     int i;
 105   };
 106 };
 107
 108 // This is the behavior in C++ as well, so making sure we reproduce it here.
 109 struct InAnonymousFollowedByEmpty {
 110   struct FlexibleArrayMem a; // expected-warning {{field 'a' with variable sized type 'struct FlexibleArrayMem' not at the end of a struct or class is a GNU extension}}
 111   struct {};
 112 };